Compilation error when adding lwm2m client on CHIP/matter sample

[Romain_KM]

Hi,

We are trying to add lwm2m (client) into light bulb sample (matter).

It results a redefinition of gethosname : CONFIG_LWM2M defines CONFIG_NET_SOCKETS_POSIX_NAMES and it seems that CHIP is using BSP ones.

Do you have an idea to solve that problem? 

In file included from C:/Users/Romain/Soft/ncs/zephyr/include/zephyr/posix/pthread.h:13,
                 from C:/Users/Romain/Soft/ncs/zephyr/lib/posix/pthread.c:12:
C:/Users/Romain/Soft/ncs/zephyr/include/zephyr/posix/unistd.h:38:19: error: redefinition of 'gethostname'
   38 | static inline int gethostname(char *buf, size_t len)
      |                   ^~~~~~~~~~~
In file included from C:/Users/Romain/Soft/ncs/zephyr/include/zephyr/posix/unistd.h:13,
                 from C:/Users/Romain/Soft/ncs/zephyr/include/zephyr/posix/pthread.h:13,
                 from C:/Users/Romain/Soft/ncs/zephyr/lib/posix/pthread.c:12:
C:/Users/Romain/Soft/ncs/zephyr/include/zephyr/net/socket.h:809:19: note: previous definition of 'gethostname' was here
  809 | static inline int gethostname(char *buf, size_t len)

How to reproduce : use the matter sample (light bulb) and add CONFIG_LWM2M.

Thanks for your help

[Romain_KM]

Hi Simon, thanks for your help.

NCS version is 2.0.99. According to LWM2M client library, it is not really related to implementation (from Nordic) the mix package interested in (CHIP vs LWM2M) about socket calls (BSD vs POSIX).

Maybe that ticket is more zephyr related. I will close this thread.